Subtract 2x2-3xy from the sum of x2-3y2+11xy and y2-4x2+9xy.
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Step-by-step explanation:
x^2 - 3y^2 + 11xy + y^2 - 4x^2 +9xy - 3x^2 - 2y + 20xy - 3x^2 - 2y^2 + 20xy - 2x^2 - 3xy
- 5x^2 - 2y^2 + 17xy
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